More bad news about the Iran nuclear deal landed Monday — a dangerous secret that President Obama has been keeping from the American people.

The Associated Press reports that the unpublished side deal is even more disastrous than the rest of the accord. It relaxes key restrictions on Iran's nuclear program in just over a decade, rather than the 15 years Team Obama has been touting.

As of January 2027, Iran can start replacing its mainstay centrifuges with thousands of advanced machines up to five times as efficient as what it now has.

Bottom line: The time Iran needs to produce a nuclear bomb would be cut in half, or worse. If Obama's correct that the current rules leave Tehran a year from sprinting to the bomb, it'll become at most six months.

And because the secret deal doesn't spell out what happens after year 13, it could mean an end to all restrictions on centrifuges.

The head of the Institute for Science and International Security, a go-to agency on Iran's nuclear program, says the side deal "will create a great deal of instability and possibly even lead to war."

Yet just last week, the president boasted that his deal — which provides the mullahs with tens of billions in sanctions relief for use on terrorism — is "avoiding further conflict and making us safer." Really?

All this proves that Israeli Prime Minister Benjamin Netanyahu, whom Obama openly mocked as a scare-monger for warning that Iran's "breakout time" was six months or less, was anything but.

Since agreeing to the deal, Iran has kept on testing ballistic missiles that can deliver nuclear warheads. It's also been caught in clandestine efforts to illicitly acquire high-level nuclear technology and equipment.

It's becoming alarmingly clear that Team Obama played the American people — and the congressional Democrats who supported the deal — for fools.